gradScheme Calculation

doubtsincfd · July 5, 2011, 12:37

How does OF calculate gradient. Suppose Gauss linear is the chosen grad scheme. Which cells does it consider for calculating the gradient?

If the grid is cartesian (perfectly aligned with x,y and z axes), calculation of gradients on the faces of the cell is straightforward. But how does OF handle for a grid not aligned with x,y and z axes?

kathrin_kissling · July 6, 2011, 08:31

Hey,

have a look at the dissertation of Hrv Jasak.
http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf
The nonorthogonal correction is explained there.

Best

Kathrin

July 5, 2011, 12:37	gradScheme Calculation	#1
doubtsincfd Senior Member Join Date: Nov 2009 Location: Michigan Posts: 135 Rep Power: 16	How does OF calculate gradient. Suppose Gauss linear is the chosen grad scheme. Which cells does it consider for calculating the gradient? If the grid is cartesian (perfectly aligned with x,y and z axes), calculation of gradients on the faces of the cell is straightforward. But how does OF handle for a grid not aligned with x,y and z axes?

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July 6, 2011, 08:31		#2
kathrin_kissling Senior Member Kathrin Kissling Join Date: Mar 2009 Location: Besigheim, Germany Posts: 134 Rep Power: 17	Hey, have a look at the dissertation of Hrv Jasak. http://powerlab.fsb.hr/ped/kturbo/Op...jeJasakPhD.pdf The nonorthogonal correction is explained there. Best Kathrin